/*
 * Copyright (c) 2005, 2006, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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 *
 */

package com.sun.org.apache.xerces.internal.util;

import java.util.Enumeration;
import java.util.Vector;
import javax.xml.namespace.NamespaceContext;

/**
 * Writing a wrapper to re-use most of the namespace functionality
 * already provided by NamespaceSupport, which implements NamespaceContext
 * from XNI. It would be good if we can change the XNI NamespaceContext
 * interface to implement the JAXP NamespaceContext interface.
 *
 * Note that NamespaceSupport assumes the use of symbols. Since this class
 * can be exposed to the application, we must intern all Strings before
 * calling NamespaceSupport methods.
 *
 * @author Neeraj Bajaj, Sun Microsystems, inc.
 * @author Santiago.PericasGeertsen@sun.com
 */
public class NamespaceContextWrapper implements NamespaceContext {

  private com.sun.org.apache.xerces.internal.xni.NamespaceContext fNamespaceContext;

  public NamespaceContextWrapper(NamespaceSupport namespaceContext) {
    fNamespaceContext = namespaceContext;
  }

  public String getNamespaceURI(String prefix) {
    if (prefix == null) {
      throw new IllegalArgumentException("Prefix can't be null");
    }
    return fNamespaceContext.getURI(prefix.intern());
  }

  public String getPrefix(String namespaceURI) {
    if (namespaceURI == null) {
      throw new IllegalArgumentException("URI can't be null.");
    }
    return fNamespaceContext.getPrefix(namespaceURI.intern());
  }

  /**
   * TODO: Namespace doesn't give information giving multiple prefixes for
   * the same namespaceURI.
   */
  public java.util.Iterator getPrefixes(String namespaceURI) {
    if (namespaceURI == null) {
      throw new IllegalArgumentException("URI can't be null.");
    } else {
      Vector vector =
          ((NamespaceSupport) fNamespaceContext).getPrefixes(namespaceURI.intern());
      return vector.iterator();
    }
  }

  /**
   * This method supports all functions in the NamespaceContext utility class
   */
  public com.sun.org.apache.xerces.internal.xni.NamespaceContext getNamespaceContext() {
    return fNamespaceContext;
  }

}
